package com.li182.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.li182.dto.LoginFormDTO;
import com.li182.common.Result;
import com.li182.dto.UserDTO;
import com.li182.entity.User;
import com.li182.mapper.UserMapper;
import com.li182.service.IUserService;
import com.li182.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

import static com.li182.common.RedisConstants.*;
import static com.li182.common.SystemConstants.USER_NICK_NAME_PREFIX;

@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1 效验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
            //2 不符合，返回错误信息
            return Result.fail("手机号格式错误");
        }
        //3 符合，生成验证码
        String code = RandomUtil.randomNumbers(6);
        //4 保存验证码到redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //5 发送验证码
        log.debug("验证码发送成功,验证码为{}",code);
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1 效验手机号
        String phone = loginForm.getPhone();
        if(RegexUtils.isPhoneInvalid(phone)){
        //2 不符合，返回错误信息
            return Result.fail("手机号格式错误");
        }

        String code = loginForm.getCode();
        //3 从redis获取验证码并效验
        String cachcode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        if (cachcode == null || !cachcode.equals(code)) {
            return Result.fail("验证码错误");
        }
        //4 一致，根据手机号查询用户
        User user = query().eq("phone", phone).one();
        //5 判断用户是否存在
        if (user == null) {
            //6 不存在，创建新用户并保存
            user = createUserWithPhone(phone);
        }
        // 7 保存用户信息到redis中
        //7.1 随机生成token作为登录令牌
        String token = UUID.randomUUID().toString();
        //7.2 将User对象转换成HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName,fieldValue)->fieldValue.toString()));
        //7.3存储
        String tokenKey = LOGIN_USER_KEY+token;
        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);
        //7.4设置token有效期
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL, TimeUnit.MINUTES);
        //8 返回token
        return Result.ok(token);
    }


    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone)
            .setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomNumbers(10));
        save(user);
        return user;
    }
}
